#!/usr/bin/env python3
import random
import socket
import sys
from time import sleep
from scapy.all import IP, TCP, Ether, get_if_hwaddr, get_if_list, sendp


def get_if():
    ifs=get_if_list()
    iface=None # "h1-eth0"
    for i in get_if_list():
        if "eth0" in i:
            iface=i
            break;
    if not iface:
        print("Cannot find eth0 interface")
        exit(1)
    return iface

def main():

    if len(sys.argv)<3:
        print('pass 2 arguments: <destination> "<num>"')
        exit(1)

    addr = socket.gethostbyname(sys.argv[1])
    iface = get_if()

    print("sending on interface %s to %s" % (iface, str(addr)))

    try:

      for i in range(int(sys.argv[2])):
        pkt =  Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff')
        pkt = pkt /IP(dst=addr) / TCP(dport=1234, sport=random.randint(49152,65535))
        pkt.show2()
        sendp(pkt, iface=iface)
        sleep(0.5)
    except KeyboardInterrupt:
        raise


if __name__ == '__main__':
    main()
